121402655677 has 2 divisors, whose sum is σ = 121402655678. Its totient is φ = 121402655676.

The previous prime is 121402655623. The next prime is 121402655701. The reversal of 121402655677 is 776556204121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118276839396 + 3125816281 = 343914^2 + 55909^2 .

It is a cyclic number.

It is not a de Polignac number, because 121402655677 - 2²⁷ = 121268437949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121402655177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60701327838 + 60701327839.

It is an arithmetic number, because the mean of its divisors is an integer number (60701327839).

Almost surely, 2^121402655677 is an apocalyptic number.

It is an amenable number.

121402655677 is a deficient number, since it is larger than the sum of its proper divisors (1).

121402655677 is an equidigital number, since it uses as much as digits as its factorization.

121402655677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 46.

Adding to 121402655677 its reverse (776556204121), we get a palindrome (897958859798).

The spelling of 121402655677 in words is "one hundred twenty-one billion, four hundred two million, six hundred fifty-five thousand, six hundred seventy-seven".